After reviewing the data, itis evident that from all trials run, the C16 compound was alwaysdetected first. This was then followed by the C18 and C20compounds. A major reason for this was the size of the molecule in question. AsC16 had the smallest carbon chain size, this meant that its boilingpoint was lower, due in part to the decrease in London dispersion forcesbetween the lining of the column and the molecule, compared to the other twoand therefore has a lower vapor pressure.
As significant solute movement takesplace specifically in the mobile gas phase, this meant that the C16compound travelled the quickest compared to the rest in all runs. It is alsoimportant to note that over the course of all runs done during this experiment,the peak width obtained from the GC always broadened. This is always an issuein any type of chromatography. As we have several different compounds ofvarying sizes and retention properties, there will always be an “ideal” set upfor the absorption/desorption of said compounds. These pre-set conditions arequite often not ideal for the elution of the later compounds which willfrequently take too long to reach the detector. A possible way to reduce thisis by a step-by-step change in one of the operating conditions of thechromatographer.
In the case of GC, the programming is set up in such a way sothat the column temperature can be raised at a point in time specific to wherethe latter peaks appear allowing for faster transport in the gas phase.